The problem with "free" postage is this.

You have to build the price into every item, where as before, you could charge less for the item by adding the single postage cost onto the invoice for multiple purchases.

I used to have many buyers buy 10-15 things at once and get ONE postage fee for the lot.

Since "free" postage has come in and you have to include the postage price in each item, it makes them less competitive and my multiple item purchases have dwindled greatly.

In addition, the principle of charging for a service not provided is grossly unfair.